Differential feeding mechanism for mixing-machines



A. 0 LINDBERG.

DIFFERENTIAL FEEDING MECHANISM FOR MIXING MACHINES.

APPLICATION FILED JUNE 2a, I917.

1,332,300. Patented Mar. 2, 1920.

H.0Linolbe17 anuwmtoz UNITED snares PATNT FFICE.

ALBIN O. LINDBERG, 0F COURTENAY, NORTH DAKGTA, ASSIGNOR 0F ONE-FOURTH TO WILLIAM H. PADDEII, OF COURTENAY, NORTH DAKOTA.

DIFFERENTIAL FEEDING IJIECHANISM FOR IlIIXING-IVIACHINES.

Application filed June 23, 1917.

To all whom it may concern:

Be it known that I, ALBIN O. LINDBERG, a citizen of the United States, residing at Courtenay, in the county of Stutsman and State of North Dakota, have invented certain new and useful Improvements in Differential Feeding Mechanism for Mixing- Machines, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to mechanism for mixing sand and cement together to form concrete, and the general object of the invention is to provide a mixing machine wherein the sand and cement, or other ingredients, may be thoroughly mixed together and mixed with a sufficient degree of water and discharged in mixed condition.

An object of my invention is to provide improved means for regulating and controlling the relative amounts of sand and cement, or other materials used in making the mixture, and in this connection provide means whereby relative amounts may be varied as desired by properly adjusting the mechanism to that end and to provide means whereby once the adjustment has been made, the machine may be sealed so that a contractor or workman cannot change the proportionswhich have been determined upon and which are stated in his contract.

Other objects will appear in the course of the following description.

My invention is illustrated in the accompanying drawings, wherein z- Figure 1 is a top plan view of an elevator and mixer with my improvements applied thereto;

2 is a fragmentary top plan view of the means for giving a step by step rotation to the shaft 20;

Fig. 3 is a like view to ,Fig. 2, but showing the means for giving a step by step rotation to the shaft 21;

Fig. t is a section on the line 4*4- of.

Fig. 1.

Referring to these drawings, it will be seen that Fig. 1 illustrates in its general features an elevator or like structure mounted upon a base 10. Mounted upon this base there is an elevator 11 which is constructed in any suitable manner and is shown as operated by means of a shaft 12 driven from ,a powershaft 13, i The details of construction of the elevator are unim Specification of Letters Patent.

Patented Mar. 2, 1920.

Serial No. 176,593.

. posed to discharge into the mixing chamber are a pair of hoppers 17 and 18 leading by ducts 19 int the mixing chamber. These hoppers are measuring hoppers, and disposed within the hopper 17 is a: rotatable shaft 20, and within the hopper 18' a shaft 21. These shafts carry a rotatable member formed with a series of radiating measuring compartments 22 into which the sand or cement in the hopper is discharged; As the compartments rotate, they pass successively beneath a shield plate 23 and then each compartment is successively discharged into the 'chute 19 leading to the mixing chamber.

Inasmuch as the sand and cement are discharged in different proportions, it is desirable to rotate these rotatable measuring .members at different relative speeds. To

this end, the shaft 20, as illustrated in Fig.

2, is provided with a ratchet wheel 24, and loosely mounted on the shaft is an arm 25 having a pawl 26 engaging with the ratchet wheel upon a movement of the arm 25 in one direction, but riding over the teeth of the ratchet wheel upon a movement of the arm 25 in the opposite direction. This pawl is urged into engagement by means of a. spring 27. The end of the arm is operatively connected to a rod 28. The shaft 21 is like- -wise provided with a ratchet wheel 24, an

arm 25,- a pawl 26, and a spring 27, but is connected to a rod' 29. These rods 28 and 29 are pivotally supported upon brackets 30.

Extending outward from the lower end of the elevator housing 11 is a bracket or other supporting member 30. The outer extremity of this bracket is formed to provide an upper, transversely extending recess 31 and a lower. transversely extending recess 32. The lower wall of the recess 31 extends out 1 beyond theupper wall thereof, as at 33, and

the lower wall 3-1 of the recess 32 extends out the same distance as the upper wall 33.

The upper and lower walls of the recesses 31 and 32 are perforated, as at 35, the perforations extending in a transverse series and disposed in these recesses are the levers 36 and 37, the lever 36 being pivotally connected to the extremity of the arm 28 of the rod 32, and the lever 37 being pivotally connected to the extremity of the rod These levers are provided with a plurality of perforations 38, and pins 39 and 40 are provided which extend down through the perforated walls of the recesses and through one of the perforations in the respective levers, the levers being pivoteduponthese pins.

The driven shaft 13 carries upon it a gear wheel 4:1 which operatively engages with a gear wheel on a vertical shaft 42, this last named gear wheel not being shown, and thus power is transmitted to "the vertical shaft 42. Carried upon this vertical shaft are a pair of eccentrics a3 and 44: having eccentric rings 15 whichengage respectively with the connecting rods 16 and 47, in turn pivotally connected to the adjacent ends ofthe levers 3'6 and 37, these connecting rods passing through an opening in the pedestal 4:8. It will be seen that by this mechanism a reciprocation is given to the connecting rods 46 and 4:7 and the levers 3'6 and37 oscillated, thus reciprocating the connecting rods 28 and 29 andgiving an intermittent or step by step rotation to the ratchet wheels 24: and the shafts 21 and 22. It will be seen that the angular movement of the ratchet wheels, that is the amount of rotative movement given to them upon each oscillation of one of the levers 36-611 37, will depend upon the position of the respective fulcrum pins 39 and 10. in the perforations 35. The pins 39 and 1-0 have heads a't'their upper ends and extend down through the perforations in the'bracket 30, and these pins are slotted at their lower ends so that a sealing wire or strip 49 maybe disposed through these slots of one or both pins and then sealed or locked in any suitable manner so that the pins 39 and 40 cannot be removed once they are adjusted without proper authority or without the fact of their removal and readjustment being discovered.

It will be understood that in the opera tion of this invention, the sand and cement are fed to the respective hoppers by means of the several. radiating compartments bounded by radiating blades. aredischarged into the chutes 19 and thus fedto the sorting and agitating blades in the mixing chamber 16 and then dlscharged into 7 the elevator whose housing is designated 11. The pro portions of sand and cement or other ingreclients are to be controlled by adjusting the pivotal points of the "levers 36 and 37 to adjust the throw of the levers, and the amount of rotation given to the ratchet wheels con are making. By this construction it is impossible to do this without the knowledge of the architect or other person for whom the contractor is working. Thus, the mixture delivered from the elevator or from the mixing chamber 16 is uniform at all times. It will also be noted that with my construction it is not necessary to shift the levers 3T longitudinally in order to adjust the pivot point of the levers so'that the levers remain I at all times practically in the same place,'but

that the pivot points are adjusted on the bracket 30.

Having thus described my invention, what I claim is: i

1, A mechanism of the character described inclu'ding a driven shaft, a lever, mechanism connecting one end of the lever to the driven shaft :to cause an intermittent rotation of the shaft upon an oscillation of the lever, a fulcrum for the lever adjustable longitudinally of and with relation to the lever whereby the stroke of said lever at its end connected to the driven shaft may be controlled without longitudinal movement of the lever, driving means operatively connected tothe opposite end of the lever, and

means for locking the fulcrum in any ad justed positionagainst unauthorized read justment of'said fulcrum.

2. A mechanism of the character described includinga plurality, of shafts, a plurality of levers eachi operatively connected at one end to one of said shafts to cause a rotational movement of {the shaft upon an oscillation of the lever, each of said levers being provided with a longitudinal series of perforations, means supporting each lever, each of said supporting means having a plurality of perforations arranged in longitudinal series and coacting with the perforations in each lever, ,pivot'pins passing through the perforations of the .supporting means and the perforations of the levers, there being a pivot pin for each lever independent of the pivot pin for any other lever and each pivotjpin being independently adjustable, and means common to all the levers for oscillating the levers.

3. In a mecha" ism of the character scribed, a supporting member having a series of perforations, a lever mounted upon the supporting member and having a longitudinally extending series of perforations, a pivot pin forming a fulcrum and passing through any one of the perforations of the supporting member and any one of the perforations of the lever to thereby adjust the fulcrum point of the lever, driving means for oscillating one end of the lever, and a driven device operatively connected to the other end of the lever, said pivot pin having a head at one end and being slotted and extending beyond the supporting member, and a sealing device passed through said slot and preventing unauthorized readjustment of the pin.

41. Variable speed mechanism comprising a plurality of brackets, a plurality of levers coacting each with one of the brackets, each bracket being elongated in the direction of the lever and formed with a plurality of perforations and each lever being provided with a plurality of perforations, fulcrum pins passing through each bracket and corresponding lever and adjustable independ ently of each other in said perforations of the brackets and levers to thereby variably fulcrum said levers, means operatively connected to like ends of said levers for giving uniform oscillation to these ends of the levers, and a plurality of devices to be driven at different speeds, each operatively connected to the opposite end of a corresponding lever whereby said driven devices may be driven at different speeds. Q

5. A mechanism of the character described including a supporting member formed with a series of longitudinally extending grooves arranged in stepped rela tion, a plurality of levers disposed each in one of said grooves, the walls of each of said grooves being provided with perforations arranged in a series extending in the direc= tion of the levers, each of said levers being provided with a longitudinally extending series of perforations, ivot pins, one for each of said levers adJustable in any one of the perforations of the corresponding lever and in the perforations of the Walls of the corresponding groove, means for oscillating said levels, a plurality of devices designed to be driven at different speeds with relation to each other, and means operatively connecting said levers to said driven devices.

6. A mechanism of the character clescribed comprising a plurality of shafts, each provided with a ratchet wheel, a plurality of supporting members, a plurality of levers mounted on the supporting members, one for each shaft, the supporting members and the levers being formed with a longitudinal series of perforations, pivot pins one for each lever adapted to be disposed in any one of the corresponding perforations of the lever and supporting member, means common to all of said levers for oscillating the levers, links operatively connected each to one of said levers, and pawls operatively connected to the links and coacting each with one of said ratchet wheels.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses.

ALBIN O. LINDBERG.

lVitnesses W. H. PADDEN, A. F. KLENK. 

